PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic apparatus equipped with three-dimensional display technology which performs pattern recognition processing while suppressing the decrease in a frame rate.SOLUTION: An ultrasonic diagnostic apparatus includes: an image construction part for constructing an image in which a three-dimensional object to be observed in the body of a subject is projected to a projection plane based on information obtained through ultrasonic transmission/reception repetition that repeats the transmission of ultrasonic waves to the inside of the subjects body and the reception of the ultrasonic waves that are reflected inside the body and returned an image display part for displaying the image constructed in the image construction part and a pattern recognition part for recognizing a three-dimensional objects pattern to be recognized based on the depth distribution information of the three-dimensional object.COPYRIGHT: (C)2014,JPO&INPIT【課題】本発明は、三次元表示技術を搭載した超音波診断装置に関し、フレームレートの低下を抑えつつパターン認識処理を行なう。【解決手段】被検体内への超音波の送波と被検体内で反射して戻ってきた超音波の受波とを繰り返し、超音波の送受波の繰り返しから得られた情報に基づいて、被検体内の観察対象の三次元対象物が投影平面に投影された画像を構築する画像構築部と、画像構築部で構築された画像を表示する画像表示部と、三次元対象物上の認識対象のパターンを三次元対象物の深度分布情報に基づいて認識するパターン認識部とを備えた。【選択図】 図2